I am assuming that since you haven't posted to this again, everything turned out fine. I have a batch that is doing EXACTLY what you described. Except 1) they did fine for a week then all started dropping like flies over the past day and 2) they aren't responding to the heat and it doesn't...
They have had grass and waterfowl starter for food (no meds), access to water and they were in a covered ferret cage overnight it has two bottoms so the droppings would fall through (heat lamp on the one side). I set them outside when it was sunny and brought them in when it rained or got dark.
I lost eight 1 week old goslings in just over 24 hours. Instead of explaining, I think it's easier to just copy and paste the email I sent to the hatchery. I am not holding out hope for the other two since the 8 that I had earlier seemed nice and healthy until they were suddenly on the brink of...